Pump



. July 6, 1926. 1,591,388

I. C; JENNINGS PUMP " Filed July 2, 1921 2 Sheets-Sheet 1 ATioRNEYs.

'4 4? j INVENTOR- 'July 6 ,;1926.

l. C. JENNINGS PUMP Filed July 2; 1921 2 Sheets-Sheet 2 Patented July 6,1926.

1 UNITED STATES I 1,591,388 PATENT ounce.-

IRVING C. JENNINGS, OF SOUTH NORWALK, CONNECTICI JT, ASSIGNOR TO NASHEN- GINEEBING COMPANY, OF. SOUTH NORWALK, CONNECTICUT, A CORPORATION.OF

CONNECTICUT.

Application .filed July 2,

The present invention relates to pumping apparatus and particularly toliquid pumps having rotary pistons.

He'retofore rotary pumps have not been used generally to pump liquidsincases where'the liquid to be pumped is at a lower level than the pumpitself because of'the difficulty in priming the pump upon starting toremove all air and gas from the intake, which when present .in onlysmall amounts prevents the successful operation of the pump. Where suchpumps are located below the tank or receptacle containing the liquid tobe pumped they are automatically primed by liquid which flows downwardlyfrom the tank and into the intake of the pump; It is very frequentlydesired however to install a rotary pump above the tank or receptacle inwhich the liquid is held and in accordance with the present invention apumping apparatus is provided in which a rotary piston pump is used toim peel the liquid and an auxiliary means is provided for automaticallypriming the rotary liquid pump whenever it is' called into operation, sothat the pump may be placed above the tank or receptacle containing theliquid to be pumped and will operate efiiciently and satisfactorily insuch position. The priming device, which is preferably an air pump forexhausting theair or gas in the inlet conduit of the liquid pump, isalso preferably connected to the driving means for the liquid pump sothat whenever the last mentioned pump is called into opera-- tion itwill be automatically primed and will operate romptly and without wasteof power. nce in operation continuous action of the liquid pump isassured by the continuous operation of the primer which prevents anygathering of air in the intake to the pump.

One form of the invention is illustrated in the accompanying, drawingsbut it will be understood that the invention may be embodied in variousforms of which that illustrated is an example. In the drawings:

Fig. 1 illustrates diagrammatically the pumping apparatus; and

Fig. 2 is a longitudinal. section through the rotary pump with itsassociated priming apparatus.

The numeral 10 indicates a tank or receptacle such as a sump or hot welland the PUMP.

1921. Serial No. 482,179.

numeral 11 indicates a second tank into which the water pumped may bedischarged. The conduit through which the water is pumped includes apipe 12 having its lower end or intake protected by screen 13 andsubmerged in tank 10, and a pipe 14 the uptions in gas pumps, describedand illustrated in patents to L. H. Nash, Numbers 953,222

and 1,091,529 and to I'. C. Jennings, 1,297,- 692, respectively. Asshown clearly in-Fig- 'ure 2, this air pump has a rotary impeller orpiston 18', which is mounted upon the same shaft 19 which supportspiston 15 of the water pump, this shaft being driven by the electricmotor 20 so that both gas and liquid pumps are simultaneously operated.The intake pipe 21 of the air pump communicates with the interior of theseparating chamber 16 through a restricted orifice 22 which, whileoffering but slight resistance to the passage of air to the pump, offersa substantial resistance to the passage of liquid.

The outlet conduit from the air pump is indicated at 23 and this outletopens into the top of a separating tank 24 from which the air escapesthrough a pipe 25, the tank retaining any water which may flow from theair pump. The bottom of the separating tank 24 communicates with theinterior of the air pump by means of a pipe 26, and an overflow 27leading back to the tank 10 serves to carry off any excess water whichmay happen to be drawn through the re 'stricted'orifice 22 and the pipe21 into the air pump and thence to the separating tank 24. The water inthe separating tank 24 normally stands with its level at the height ofthe upper end of overflow pipe 27 which level is higher than the pointwhere pipe 26 enters the air pump, so that a primin charge normallytends to flow from the tan to this pump at all times.

per end of which opens into tank 11. The

' and primes the inlet of the ,liquid pump.

ping the motor.

The motor 20 is preferably started and stopped automatically, having amain line switch 30 adapted to be opened and closed by a circuit closingswitch 31 which is in turn controlled bya float 32. Float 32 movesvertically on a rod- 33 connectedto switch arm 31' and stops 34 aresecured to this rod, one stop being "at the lower end of the rod nearthe bottom of the tank 10 and the second stop being near the top of thetank. As the tank fills, float 32 will strike the upper stop 34, closeswitch 31 and operate main line switch. 30 to start the motor. The airpump exhausts the air from the separating chamber 16 so that waterislifted by suction through intake tube .12

Water entering the inlet of this pump d18- places the air containedtherein and the pump is enabled thereby to exercise a lifting force onthe column of-water and to force it throng pipe 14 and into the elevatedtank 11 or'to a y other place to which it is to be pumped.

vents a back flow of liquid through the pump when the pump is not inoperati011 and also prevents air from being drawn downwardly and throughthe pump into the separating chamber 16 when the pump is first started.As the tank 10 empties float 32 descends and finally contacts with thelower stop 34, opening switch31 and stop The apparatus will then beinactive until the tank again fills, when this cycle of operations willbe repeated.

Having thus described the invention what is claimed as new and desiredto be secured tarv liquid pump having a gas and liquid separatingchamber at its intake side, aropassage for gas is provided, but littleliquid can flow therethru, and means constantly supplying said gas pumpwith the liquid necessary for its operation.

2. Pumping apparatus of the character described including incombination, a rotary liquid pump having a gas andliquid separatingchamber at its intakeside, a 1'0- tary gas pump of the type employingliquid for its pumping action, a conduit connecting said chamber withthe intake of 'the gas pump, said conduit having a' restricted orifice,whereby at all times a free passage for gas is provided, but littleliquid can flow through said orifice, a gasand-liquid separating tankconnected to the outlet of the gas pump, and an independent conduitextending from said tank to said gas pump to keep the latter, suppliedwith the liquid necessary for its operation.

3. In a pumping apparatus in combination, a unitary structure comprisinga rotary liquid pump and a hydro-turbine gas pump, said structure beingadapted to' be placed above the level of liquid to be pumped, a liquidand gas separating chainber on the intake side of the liquid pump, a

connection between said chamber and the intake side of the gas pumpwhereby the gas pump is adapted to prime the liquid pump, a gas andliquid separating tank on the discharge side of the gas pump, said tankbeing adapted to supply the gas pump with the liquid necessary for itsoperation.

In testimony whereof I hereunto aflix my signature; r

' IRVING C. JENNINGS.

